...本概念和术语 一、变量和常量（variable and constant） 二、连续变量与离散变量（continuous variable and discrete variable）三、自变量与因变量（independent ..
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Joined up optimization of continuous variable and discrete variable, the difficult was solved by using the idea of multi-objections.
采用多目标规划的思想，将离散变量优化和连续变量优化结合起来，较好解决了离散变量优化设计时的难点。
In sizing optimization of truss with discrete variables, joined up optimization of continuous variable and discrete variable, the idea of multi-objections is used.
对离散变量的析架尺寸优化问题，本文提出了采用多目标规划的思想、将离散变量优化和连续变量优化结合起来的求解方法。
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